A 47 year-old Chico woman has admitted to elder abuse and could spend three decades in prison. Butte County District Attorney Mike Ramsey says Desiree Serena has admitted to the repeated abuse of a man in his 70's who was in her care. Investigators say Herrera was working as the man's home health assistant. Relatives say she kept the man confined to his house. Prosecutors say she forced the man to sleep on the floor and keeping his family members away from the home all while managing his life and finances. Herrera pled guilty to charges of elder abuse and felony assault. As part of the plea agreement Herrera will receive the upper term of 29 years in state prison